Refactor backend services and utilities

- Update service layer implementations
- Improve configuration handling utilities
- Update documentation tasks

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

backend/app/services/jail_config_service.py

@@ -70,8 +70,6 @@ async def _get_active_jail_names(socket_path: str) -> set[str]:
 # Constants
 # ---------------------------------------------------------------------------
 
-_SOCKET_TIMEOUT: float = 10.0
-
 # Sections that are not jail definitions.
 _META_SECTIONS: frozenset[str] = frozenset({"INCLUDES", "DEFAULT"})